Fix: Asset validity when used between multiple Nested playlists in the same Master playlist

Improvement: Stop an interrupt from restarting if the same interrupt key/signal is used while the interrupt is playing

Fix: 86BH5C stretch model will now scale video correctly

Improvement: Relax the 1 concurrent video only restriction on newer models (webOS 3.0 and higher)

Improvement: Screenshots should no longer display black frames when videos are playing, on certain LG models
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​Note: Black areas may still show in remote screenshots when using videos in widgets on webOS 3.0 and 3.2 models and there is currently no workaround for this. This is a limitation of these webOS generations. This issue is resolved in webOS 4.0 and 4.1 as long as the players are using firmware 04.x
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​More detail: https://support.signagelive.com/hc/en-us/articles/360018583678-Remote-Screenshots-Support-on-the-LG-platform-will-Remote-Screenshots-include-videos-

Improvement: webOS 4.0 / 4.1 UHD models will now render UHD videos at full resolution (previously they were restricted to FHD only)